Surface and corrosion properties of modified passive layer on 304 stainless steel as bipolar plates for PEMFCs
| Autor: | M.A. Golozar, M. Dadfar, M. Salehi, M.P. Casaletto, Stefano P. Trasatti |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Materials science
Scanning electron microscope Surface treatment Oxide Energy Engineering and Power Technology chemistry.chemical_element 02 engineering and technology Corrosion Chromium chemistry.chemical_compound X-ray photoelectron spectroscopy 0502 economics and business Pickling XPS 304SS passive film Surface layer 050207 economics Renewable Energy Sustainability and the Environment 05 social sciences Metallurgy 021001 nanoscience & nanotechnology Condensed Matter Physics Fuel Technology chemistry 0210 nano-technology Nitriding |
| Zdroj: | International journal of hydrogen energy 42 (2017): 25869–25876. doi:10.1016/j.ijhydene.2017.08.169 info:cnr-pdr/source/autori:Dadfar, M.; Salehi, M.; Golozar, M. A.; Trasatti, S.; Casaletto, M. P./titolo:Surface and corrosion properties of modified passive layer on 304 stainless steel as bipolar plates for PEMFCs/doi:10.1016%2Fj.ijhydene.2017.08.169/rivista:International journal of hydrogen energy/anno:2017/pagina_da:25869/pagina_a:25876/intervallo_pagine:25869–25876/volume:42 |
| ISSN: | 0360-3199 |
| Popis: | In this study, the relation between surface chemistry and corrosion properties of modified 304 stainless steels (304SS) was investigated. 304SS samples were submitted to plasma nitriding performed at two different temperatures: 420 degrees C (low) and 520 degrees C (high). Then, a thermo reactive deposition (TRD) was used in a mixture of ferro niobium, alumina and ammonium chloride. Finally, a pickling treatment was performed to access high corrosion resistant surfaces. Surface treated samples, both before and after pickling, were investigated by using Scanning Electron Microscopy (SEM) and Potentiodynamic (PD) techniques. X-ray Photoelectron Spectroscopy (XPS) was performed for the analysis of the surface layers of the samples after pickling. The surface layers were mostly comprised of iron and chromium oxides and hydroxides. XPS results proved the presence of a surface layer mostly constituted by iron oxides and oxyhydroxides for both the treated samples that resulted more homogenous for the sample nitrided at low temperature. Chromium was detected by XPS in the predominant form of oxide on the surface of the sample nitrided at low temperature. |
| Databáze: | OpenAIRE |
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